package org.bouncycastle.asn1.x509;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DERSequence;

/**
 * The AuthorityInformationAccess object.
 * 
 * <pre>
 * id-pe-authorityInfoAccess OBJECT IDENTIFIER ::= { id-pe 1 }
 * 
 * AuthorityInfoAccessSyntax  ::=
 *      SEQUENCE SIZE (1..MAX) OF AccessDescription
 * AccessDescription  ::=  SEQUENCE {
 *       accessMethod          OBJECT IDENTIFIER,
 *       accessLocation        GeneralName  }
 * 
 * id-ad OBJECT IDENTIFIER ::= { id-pkix 48 }
 * id-ad-caIssuers OBJECT IDENTIFIER ::= { id-ad 2 }
 * id-ad-ocsp OBJECT IDENTIFIER ::= { id-ad 1 }
 * </pre>
 */
public class AuthorityInformationAccess extends ASN1Encodable {
    private AccessDescription[] descriptions;

    public static AuthorityInformationAccess getInstance(Object obj) {
        if (obj instanceof AuthorityInformationAccess) {
            return (AuthorityInformationAccess) obj;
        }

        if (obj instanceof ASN1Sequence) {
            return new AuthorityInformationAccess((ASN1Sequence) obj);
        }

        if (obj instanceof X509Extension) {
            return getInstance(X509Extension.convertValueToObject((X509Extension) obj));
        }

        throw new IllegalArgumentException("unknown object in factory");
    }

    public AuthorityInformationAccess(ASN1Sequence seq) {
        descriptions = new AccessDescription[seq.size()];

        for (int i = 0; i != seq.size(); i++) {
            descriptions[i] = AccessDescription.getInstance(seq.getObjectAt(i));
        }
    }

    /**
     * create an AuthorityInformationAccess with the oid and location provided.
     */
    public AuthorityInformationAccess(DERObjectIdentifier oid, GeneralName location) {
        descriptions = new AccessDescription[1];

        descriptions[0] = new AccessDescription(oid, location);
    }

    /**
     * 
     * @return the access descriptions contained in this object.
     */
    public AccessDescription[] getAccessDescriptions() {
        return descriptions;
    }

    public DERObject toASN1Object() {
        ASN1EncodableVector vec = new ASN1EncodableVector();

        for (int i = 0; i != descriptions.length; i++) {
            vec.add(descriptions[i]);
        }

        return new DERSequence(vec);
    }

    public String toString() {
        return ("AuthorityInformationAccess: Oid(" + this.descriptions[0].getAccessMethod().getId() + ")");
    }
}
